GPRC5A and colonic neoplasm: In literature, RAI3 has been suggested as prognostic marker in several cancer types, including colon cancer (Kume et al. 2014; Zougman et al. 2013), gastric cancer (Cheng et al. 2012), oral squamous cell carcinoma (Liu et al. 2013), and hepatocellular carcinoma (Zheng et al. 2014).